What the plans actually differ on
Every plan translates all 79 languages. The difference is not what Voxis understands — it is what you hear.
Paid plans stream the translated voice from the cloud engine, so all 79 languages are spoken aloud.
The free tier translates in the cloud but speaks on your own machine, using open neural voices. Those exist for 35 of the 79. Choose one of the other 44 and translation still runs — it arrives as live subtitles instead of speech. Nothing breaks; you just read it rather than hear it.